Apparatus for testing coils



July 3, 1928.

J. F. M cWlLLlAMS APPARATUS FOR TESTING COILS Filed Oct. 28, 1924 INVENTOR a, W um I i tha July 1928,

UNITED tirs eans 1*.

JQNT Y OFFICE.

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I Application filed October-28, 1924. Serial No. 746,839.

I m ratus by means of which such coils may be easily and quickly tested.

' In the accompanyin drawin .there is I 7 shown, for purposes 0 illustration only, a

preferred embodiment of the present invention, it being understood that the drawings "do not define the limits of the invention as changes in the'construction and operation shown therein may be made without departing from the spirit of the invention or scop broader-claim. v

In the drawings I 1 Figure 1 is a perspective view of a testing instrument embodying the present invention, Figure 2 is a die ammatic view illustrating a portion of to instrument shown in E m I igure 3 is a diagrammatic view illustrating "a modified method of connecting the units of the primary coil, and

Figure 4 is a view similar to-Figure 3 illustrating still another method of connecting the coil units. 1

- In 'aceordancewith the present invention there may be provided a base 2 of suitable construction, adaprtfid to receive therein a 7 suitable core 3. is core'is preferably of th well @own' character comprising a series joflaminations of soft iron, and may be convenientl of generally U-shape as illustrated. 011s of the legs oithe'core may have applied thereto-a rimary coil 4 comprising any desired n in of'units a, b, c and In the embodiment of the invention illustrated, four I of these units are provided. --In Figure 2 of the drawings these are shown as connected to illustrated in Figure 3, while if they are to in series whereby they may be utilized with be used with a standard 110 volt circuit they may be connected in parallel as shown in Fi re 4;

e base 2 preferably has mounted thereon a suitable switch which may conveniently be of the double-pole single-throw type adapted to connect line wires L and L to the primary coil. One side of the circuit to the primary coil is preferably completed through an indicator, such as an ammeter A, for indicating the current flow through the primar winding.

ounted on the base adjacent the leg of the core carrying the ,primary winding is a support v(i which may conveniently be formed of strip metal having its up er ortion shaped to receive a bearing in T is pin extends transversely throng the side members 8 carrying therebetween aseries of laminations'9 adapted to cooperate with'the le s of the core and complete the flux pat h thereof.

In Figure side of the core is shown in elevated osition, whereby the free leg thereof isadhpted to easily receive a coil 0 to be tested, as indicated in dotted lines in Figure 2. After the coil to be tested has been placed in position, the movable side of the'core is swung downwardly to come into contact with the upper ends of the U-shaped portion and thereby complete the flux ath. As is well understood, should the coi being tested be free from any short circuit the current flow through the primary winding will not vary, but Wlll remain of the character ordinarily referred to as a wattless current. On the other hand, if the coil G should contain a short circuit, it will constitute in effect a 1 of the drawings the movable closed secondary circuit, thereby immediate 1y changing the conditions of flow through the primary. This will result in a greater current flow through the primary winding,

tion of the indicating means provided.

It will be apparent that the apparatus disclosed herein provides means adapted for use with difi'erent circuits whereby coils may be quickly tested. In the event the a paratus is required for use with circuits avas may be readily observed from an inspec-- ing a higher voltage than those set forth herein the number of units in the primary coil may be varied at will, or other changes made therein as well understood in the art.

The advantages of the present invention arise from the revision of means whereby coils may be quickly and easily tested irrespective of the voltage of the circuit available for such testing purposes.

I claim:

a core having a primary coil thereon andadapted to receive as a secondary the coil to be tested, and means for indicating the current flow through the primary coil, said primary coil comprising a plurality of units adapted to be connected in diflerent relation ship for use with circuits of difierent voltages.

my hand. 7

JAMES F. MAGWILLIAMS- In testimony whereof I havehereunto set 

